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Book/Report | FZJ-2018-01094 |
1977
Kernforschungsanlage Jülich, Verlag
Jülich
Please use a persistent id in citations: http://hdl.handle.net/2128/17026
Report No.: Juel-1467
Abstract: The ionization times and the magnetic flux requirement for the breakdown phase of a Tokamak discharge were calculated from a simplified model. The coupled continuity equations for the electron and neutral gas component were solved numerically for a homogeneous plasma. The relevant physical processes in the initial phase were expressed as a function of the reduced electric field and included into the model. The initial values and boundary conditions used were taken specifically for our toroidal experiment TEXTOR /7/ (R = 175 cm, a = 50 cm, B$_{\varphi}$ = 20 kG, I$_{p}$ = 480 kA). A breakdown delay time is caused by the presence of a closed metallic vessel. A strong dependence of the breakdown time is observed for realistic toroidal voltages. For TEXTOR bd-times $\tau_{z} \gtrsim$ 1 msec are to be expected. The temporal development of electron density and neutral gas concentration in the early discharge phase is discussed.
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